--  @testpoint:opengauss关键字checked(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists checked;
create function checked(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function checked;

--关键字带双引号-成功
drop function if exists "checked";
create function "checked"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "checked";

--关键字带单引号-合理报错
drop function if exists 'checked';
create function 'checked'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `checked`;
create function `checked`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/